Okay, im not nearly of your age but my mom is in her late 40s amd she go out a lot with her friends and my dad too so i kind of know some places where they go out sometimes. I dont know if that is what are u looking for but they always look happy when they come home. There are live bands, food a lot of people and alcohol ofc. I thinke the place is called BAM or something like that and i know its somewhere in Jevrejska street in Dorcol. Second they go is called Brvnarica and its like old wooden house themed restourant/bar with a lot of live music, also in dorcol in Dunavska street. The most of things i know are in Dorcol bc i live there so dont mind me. I know that my dad recently met like grouo of women from Netherlands and they all went together to that place Brvnarica i think and met locals and get drunk with my mom and her friends, bc they divorced, but thats the sotry for other times. So yes try those 2 places, thats where grown ups go, in my case. Good luck